Polymerization inhibitor for vinyl aromatics

Details Polymerization inhibitor for vinyl aromatics Polymerization inhibitor for vinyl aromatics

C - Chemistry, Metallurgy

07

C

C07C 309/75 (2006.01) C07C 7/20 (2006.01) C07C 205/22 (2006.01) C07C 205/23 (2006.01) C07C 211/51 (2006.01) C07C 317/22 (2006.01)

Patent

CA 2118045

2118045 9322261 PCTABS00027 This invention relates to a vinyl aromatic, especially styrene, polymerization inhibitor system comprising a reaction product of an alkyl phenol with sulfuric acid and nitric acid and optionally an aryl-substituted phenylenediamine. The reaction product has as its major component compounds of Structure (I), wherein R is C9-C20 alkyl, Y is NO2, SO3R' or H, R' is C1-C20 alkyl, X is NO2 or C1-C20 alkyl, and R" is H or C1-C20 alkyl, m is 2 or 3 and n is 0, 1, 2, 3, with the proviso that when R is C9 and n=0, X and Y may not both be NO2. The invention is also directed to vinyl aromatic compositions stabilized against polymerization by such polymerization inhibitor system, as well as to a method of stabilizing a vinyl aromatic composition against polymerization which method comprises adding an effective amount of such polymerization inhibitor system.

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